package com.lt.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.lt.reggie.common.BaseContext;
import com.lt.reggie.common.R;
import com.lt.reggie.entity.Employee;
import com.lt.reggie.service.EmployeeService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.time.LocalDateTime;

/**
 * 检查用户是否已登录
 */
@WebFilter
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();

        //
        log.info("拦截到的请求: {}",requestURI);

        //定义默认放行的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"

        };

        //2、判断此次请求是否处理
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if (check) {
            filterChain.doFilter(request,response);
            return;
        }

        //4-1、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null) {
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setThreadLocal(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null) {
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setThreadLocal(userId);
            filterChain.doFilter(request,response);
            return;
        }

        //5、如果未登录则返回未登录结果,通过输出流向客户端页响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查此次请求路径是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI){
        for (String url : urls) {
            boolean check = PATH_MATCHER.match(url, requestURI);
            if (check) {
                return true;
            }
        }
        return false;
    }


}
